Mhm. This could be a multitude of things.
- Boot fails completely
- only USB serial / CDC broken
- wrong monitor settings
Can you upload a blink LED sketch and see if it blinks it successfully? Then it can’t be a boot problem.
Another thing to try is because of
This is unusual because other S3 boards have that set to false
It might indicate that you have to have the monitor settings for monitor_dtr and monitor_rts to either both no or yes (sometimes the logic is inverted). Please try in any case all 4 possible combinations listed here.